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timing chain replacing

Old Nov 19, 2005 | 08:12 PM
  #1  
anything-z's Avatar
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From: st louis
Car: 86 Iroc
Engine: 87 305 tpi
Transmission: auto
timing chain replacing

I know this topic has been hit on many times but i need to know before i go out tomorrow and ruin anything else. how should the crank and cam gears line up. this is a 305 and i've got #1 at TDC. I've heard that the dots should line up with the cam dot at 6oclock and the crank dot at 12oclock. but wouldn't that put me 180* out ? I thought that with #1 at TDC, both gears should be at 12 oclock.
also, i have not taken the dist. out. and the rotor is pionted at #1.
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Old Nov 19, 2005 | 08:19 PM
  #2  
84z28350's Avatar
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From: Yellowknife, NWT, Canada
Car: 84 Z28
Engine: 357
Transmission: TH-350C
Axle/Gears: 3.43
Both dots together.

Crank at 12 o clock and cam at 6 o clock
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Old Nov 19, 2005 | 10:29 PM
  #3  
xpndbl3's Avatar
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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
both dots touching each other is TDC for #6 cylinder. both dots at the top of the gears is TDC for #1 cylinder. you would be 180 out unless you put the rotor on #6 cylinder with both dots touching. hope this helps
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Old Nov 19, 2005 | 10:31 PM
  #4  
Blackbob's Avatar
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From: Orlando,Florida
Car: 85' Camaro
Engine: 3.8...possibly future turbo
Transmission: whatever it came with
So um what happen ?
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Old Nov 19, 2005 | 10:38 PM
  #5  
anything-z's Avatar
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From: st louis
Car: 86 Iroc
Engine: 87 305 tpi
Transmission: auto
nothing has happened yet, i think i've messed up the threads on the crank though. i'll know better in thr morning when i go back out. but thanks for the info, i've got the gears just sitting on there in the 12 and 12 position. so i'll tighten everything down tomorrow.
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Old Nov 19, 2005 | 11:46 PM
  #6  
Stekman's Avatar
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From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
If you have the gears at 12 and 12 now, just point the rotor towards the #6 hole.
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Old Nov 20, 2005 | 09:36 AM
  #7  
firebird45331's Avatar
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From: greenville, OH
Car: 86 Firebird, 2002 Monte Carlo, 91 v
Engine: 350
Transmission: 700R4
12 and 12 is in the number one firing order 12 and 6 is number number 6 firing order
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Old Nov 20, 2005 | 10:26 AM
  #8  
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From: Orlando,Florida
Car: 85' Camaro
Engine: 3.8...possibly future turbo
Transmission: whatever it came with
Did you fix it yet ?
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Old Nov 20, 2005 | 11:52 AM
  #9  
anything-z's Avatar
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From: st louis
Car: 86 Iroc
Engine: 87 305 tpi
Transmission: auto
im out doing it right now, taking a break because the rams are about to play and the garage tv is a little crappy. should the chain be really really tight to get on?
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Old Nov 20, 2005 | 03:20 PM
  #10  
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From: VA
Car: '91 Z28
Engine: L98 5.7L TPI
Transmission: 700R4
Axle/Gears: 323's
Originally posted by anything-z
should the chain be really really tight to get on?
yep. you'll need to put the cam sprocket on to the chain and line it up to the holes on the cam, making sure the timing marks stay in place.
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Old Nov 20, 2005 | 05:56 PM
  #11  
anything-z's Avatar
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From: st louis
Car: 86 Iroc
Engine: 87 305 tpi
Transmission: auto
thanks alot people, got everything put back together execpt the water pump. i did crank it over to see if it would start. it did, i'm happy. called it quits for now and i'll finish it on tuesday.
funny thing is it started with my compression gauge still plugged into the #1 cylinder (guess i was in too big of a hurry to take it out) but all is well and i like my car once again.
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